Abstract: Conductive geopolymer was prepared with steel slag and metakaolin as main raw material. Meanwhile the influence of steel slag mixing amount and curing temperature on compressive strength, electrical resistivity, piezoresistive property and microstructure were analyzed, and then piezoresistive property was evaluated. The results show that with the increase of curing period and curing temperature, compressive strength of specimen is all increased somewhat, among which the compressive strength is the highest when steel slag mixing amount is 30%. Another, at different curing temperatures, the more the steel slag is mixed, the lower the electrical resistivity of specimen. Increase of curing temperature improves early physical and mechanical properties of specimen. However, with the growth of curing period, influence of temperature on the electrical resistivity of specimen becomes weaker. In addition, under the stress of cyclic compression load, the optimal strain sensitivity of specimen is 40.35—50.31, which is much higher than that of the resistance strain sheet (strain sensitivity is 2). Among them, when curing temperature is 40 ℃ and steel slag mixing amount is 30%, the correlation coefficient R2 between FCR and cyclic compression stress is as high as 0.953, and the piezoresistive stability is optimal. At last, microscopic analysis shows that when curing temperature is 60 ℃, microstructure is the most compact and has the best stability, resulting in a low strain sensitivity. At the same curing temperature, with increase of steel slag mixing amount, the density of specimen is first enhanced and then weakened, and the SS-30 group is optimal, which is in good agreement with the strength results. Obviously, the steel slag-metakaolin based conductive geopolymer will be an ideal piezoresistive matrix material.
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2024, Vol. 38 
